Magnetic head and magnetic disk storage apparatus mounting the head

Abstract

Embodiments in accordance with the present invention provide a magnetic head in which broadening of the write-field distribution in the track-width direction can be decreased without reducing the write-field intensity. A main pole includes a pole tip having a part which provides the write track-width and a yoke part recessed from the air bearing surface in the element height direction, the pole tip including at least two magnetic films having different track-width directions, and the throat height at the trailing side being made smaller than the throat height at the leading side.

1. A magnetic head for a perpendicular recording comprising a main pole and an auxiliary pole, wherein
 the main pole has a track-width determining air bearing surface; 
 the main pole comprises a yoke part and a pole tip; the pole tip providing the air bearing surface and the yoke part is recessed from the air bearing surface in a direction perpendicular to the air bearing surface; 
 the pole tip comprises a first magnetic film and a second magnetic film; 
 the first magnetic film is coupled to the yoke part and has, at the air bearing surface, a first width; 
 the second magnetic film is coupled to the first magnetic film and has, at the air bearing surface, a second width; 
 the second width is greater than the first width; 
 the first magnetic film has a first throat height extending perpendicular from the air bearing surface for a first distance; 
 the second magnetic film has a second throat height extending perpendicular from the air bearing surface for a second distance; and 
 the second distance is smaller than the first distance. 
 
     
     
       2. A magnetic head according to  claim 1 , wherein
 the second width of the second magnetic film is greater than the film thickness of the second magnetic film. 
 
     
     
       3. A magnetic head according to  claim 1 , wherein
 the difference of the widths of the part where the second magnetic film and the first magnetic film are connected to each other at the air bearing surface is greater than the film thickness of the second magnetic film. 
 
     
     
       4. A magnetic head according to  claim 1 , wherein
 the second magnetic film and/or the first magnetic film has at the air bearing surface a reverse-trapezoid shape. 
 
     
     
       5. A magnetic head according to  claim 1 , wherein
 the first magnetic film is recessed from the air bearing surface in a direction perpendicular to the air bearing surface. 
 
     
     
       6. A magnetic head according to  claim 1 , wherein
 a flare angle of a squeeze point of the second magnetic film is greater than a flare angle of a squeeze point of the first magnetic film. 
 
     
     
       7. A magnetic disk storage apparatus comprising:
 a recording medium; 
 a medium driving part driving the recording medium; 
 a magnetic head which has a write head and a read head which performs write and read to the recording medium; and 
 a head driving part positioning the magnetic head relative to the recording medium, wherein 
 the recording medium is a perpendicular recording medium having a soft under layer and a recording layer, 
 the write head has a main pole and an auxiliary pole, 
 the main pole has a track-width determining air bearing surface opposed to a surface of the recording medium; 
 the main pole comprises a yoke part and a pole tip; the pole tip providing the air bearing surface and the yoke part is recessed from the air bearing surface in a direction perpendicular to the air bearing surface, 
 the pole tip has first magnetic film and a second magnetic film; 
 the first magnetic film is coupled to the yoke part and has, at the air bearing surface, a first width; 
 the second magnetic film is coupled to the first magnetic film and has, at the air bearing surface, a second width; 
 the second width is greater than the first width; 
 the first magnetic film has a first throat height extending perpendicular from the air bearing surface for a first distance; 
 the second magnetic film has a second throat height extending perpendicular from the air bearing surface for a second distance; and 
 the second distance is smaller than the first distance. 
 
     
     
       8. A magnetic disk storage apparatus according to  claim 7 , wherein
 a flare angle of a squeeze point of the second magnetic film is greater than a flare angle of a squeeze point of the first magnetic film.